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Do you like Zucchini? Wild type zucchini is green. How would you explain the phenomena, where...

Do you like Zucchini? Wild type zucchini is green. How would you explain the phenomena, where a gardener crossed two different pure-breeding yellow zucchini strains and obtained all green offspring? What would be the genotypes of the parents and offspring?

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Answer #1

From the above description, it is clear that the colour is not controlled by a single gene. Let us consider that the colour is controlled by two genes: A and B

Both the genes produce the same phenotype when the other is in recessive condition. However if one or both the alleles of two genes are present in dominant condition, they complement eachother and produce the expression of wildtype.

True breeding Yellow strain genotype = AAbb or aaBB

Crossing the two strains -------------> AAbb x aaBB

Gametes -----------------------------> Ab aB

hybrids --------------------------------> AaBb

(Green)

That is what i got from the data

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